Rechargeable lithium ion button cell battery
US8993148B2 · kind B2 · utility
Inventors
Key dates
| Filing date | Sep 14, 2010 |
| Grant date | Mar 31, 2015 |
| Priority date | — |
| Expiry date | Jan 24, 2033 |
Classification
- Technology area (CPC Y)Emerging Cross-Sectional Technologies
- CPC primaryY02P70/50
- WIPO fieldElectrical machinery, apparatus, energy
- WIPO sectorElectrical engineering
Abstract
A rechargeable lithium ion button cell battery having a sealed housing comprises an inner casing and an outer casing, both casings have at least one flat area as top or bottom of the battery, and a round or oval side wall vertically formed to the flat area. Said side walls are single wall not folded double walls. An insulation gasket is positioned between said side walls, and the outer casing opening is mechanically crimped to complete the seal of the battery. Inside the sealed housing the anode & cathode electrodes are spiral wound with separator to be a round or oval roll. Said roll axis is vertical to the said flat areas of the casings. The two electrodes are tapered in width and comprise current collectors of metal foils coated with lithium-intercalating active materials, leaving small area of uncoated metal foils as welding tabs for connecting to the casings. The tabs are welded to the casings respectively, or for the tab of the electrode which connecting to outer casing, welded to an aluminum flake first and said flake is pressed on the outer casing by said gasket. Two insulation washers could be applied to inner side of the casings to prevent short circuit. Such battery has …
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.